Cartridge for fire extinguishers



April 5, i927. i VEzlZAN-l CARTRIDGE FOR FIRE EXTINGUISHERS Filed Deo. `21, 1925 JMW@ d5, l` i Patented Apr. 5, 192 7.

" UNIT-ED STATES' ALBERTO VEZZAN I, OF GEN A, ITALY.

entrainer: Foa Fmr: 'ExrING'UIsHE-Rs.

Application filed December 21,1923, Serial No. 681,902, and in Italy December 80, 1922.

There exist self-acting tire extinguishers in which. upon the breakingof a. receptacle containing one of the two` chemical reagents capable ot' producing the development of a gas, the tworeagents are brought into contact ina reaction chamber, generally known as cai'tridge the gases which arcdeveloped escaping from said. cartridge and exerting a pressure-upon the inert liquid contained in thc fire extinguisher and expelling said liquid in the shape of a violent jet.

It is also known to provide the cartridge with means, through which thegenerated gas passes, before it is expelled into the rescrvoir, to render the gas dry and non-acid.

The present invention. relates to. a car- 'tridgeof ythe aforesaid kind provided with an improved ilteringnieans adapted t pre- -veiit the tireextinguishing liquid from becoiiiing mixed with a more or less considerable quantity .ot the residues. of the gas generating materials contained in the cartridge,'which residues, in the case of being conveyed ott' by the gas developed, would diminish the ldegree of dielectricitv of the jet and consequent-ly expose the operator to danger when extinguishing tires caused by high tension currents. In the annexed drawing, diagrammatically illustrating an embodiment of the invention :'l Fig. 1 is a main central 'section of a lire extinguisher containing a cartridge provided with said improved filtering means;

Fig.'2 is a separate sectional view of the cartridge with thel improved filtering means on a larger scale.

l According to Figa-1 the lire extinguisher comprises a can 1 airtightly sealed by a closure 2, a pipe 3 whichstarting from tre,

bottom fof the can terminates iii the discharge hole 4 provided in the upper portion. of that wall of the can which is opposite the handle 5'; a striker 6 passes through the center of the closure 2.

The apparatus is Jprovided with a safety l handle 9 which keeps the striker lifted',

closes the discharge hole by means of the tongue piece and enables'the apparatus to b e suspended or to be carried by h.-.nd.

' pon the handle is sealed the Safety wire-f r11 fastened to the striker.

- Inside the 4'can 1s 'arranged a cartridge formed of a cylindrical outer casing 15 having at Athe upper porti'on a flange 13, by

means of which itrests iii a not-'rh- 14 pro-' vided inthe mouthpiece of thev can.

Inside the casing `15land at lthe-upper portion of it is suspended a cup' 16 having the shape of a truncated co'ie and airtightly sealed by means of a disc 17. l

Inside the cup is arranged another truncated cone 18, provided with holes 19, Whichcone at the moment of the blow of the striker facilitates the perforation of the disc 17 and simultaneously causes the bottom of the cup to get detached.

In tlie-` space 27 between the vouter side ofl the truncated cone 18 and the inner side of the cup 16, and also inside the truncated cone 18 is contained the chemical compound which, by. reacting with the other compound contained inside the casing 15, causes the development ofthe pressure gas.

According to the nature vof the substances employed, the solid reagent may be containedv in the eup 16 and the liquid one in fior sc f

From the ange 13 of the casing 15 a double walled jacket projects downward enclosing the cartridge and. Formed o'f-an outer tube 28 surrounding the easing 15 and an inner tube 32 open at the bottoni.

The tube 28 is provided with discharge iopenings 29, at the top, t0 communicate with 4the can-1,' while the upper portion' et the casing 15- is -provided with holes 21 which permit the cartridge to communicate with asf' the space 30 between said casing and the tube 32 upon the'breaking of the disc 17.

To charge the apparatus the stutling box 8 is"unserewed,.the closure 2 is'reinoved and the extinguishing liquid, such as tetra'- chloride of carbon, is .poured into the can, thereupon the cartridge is introduced into the receptacle andlastlythe cover 2 is again set up. i l

-If the apparatuscharfred is'not to be used at once, the safety hande 9 is turned up' so as to keep the striker in the liftedposition and the discharge hole. 4 obstructed bythe tongue piece 10; after that, the safetywire' 11 is sealed .upon the handle in order to render immovablethe striker. In this condition, the apparatus may be suspended to a stationary support. When the fire extinguisher is to' be made use of, the safety handle is turned down l which, as already stated, causes the bottom to become detached and the two reagents to come in contact with each other.

' The Vgas produced by the'reagents contained inthe cartridge passes through the holes 21 into theinteri-'ening space 30 existing between the sealing box and the jacket, follows the direction indicated by arrows (Fig. 2), ascends again in the space 31 between the two walls of the jacket and lastly` upon having passed through the holes 29 of the jacket exerts its pressure upon the tire extinguishing liquid contained in the can 1. The two Yspaces 30 and ,31 together forni the gas purification chamber; the residues,

which Vmaybe produced by the reagents, during the travel are deposited inthe said chamber so that the gas escaping through the holes 219 will be clnpletely free from l impurities.

The jacket may form an integral portion.- i

of the' cartridge or it may be detachable from the cartridge so as to facilitate the Acleaning ot thepurification chamber after f the use' ot the fire extinguisher.

I claim as my invention: I

A cartridge for tire extinguishers, coinprising an outer wall, a flange provided thereon, and a double walled jacket formed l ot two co-axlal tubes, ain outer and inner tube, projecting from saidA flange, the said tubes being spaced ,from each other andfrom said outer wall, the space between said inner tube fand said outer wall communicating with the cartridge through holes providedhat l the top of said outer wall` the space between said inner and outer tubes belng open to the outside of said outer tube, said in'ner4 tube being. open at its free end.

In testimony whereof I aliix my signa-` ture this seventh day of December 1923. i

ALBERTO 'VEZZNL 

